ATTACKING THE LEAVES. 289 



No. 158. — One of these, the Waved Proconia/ Proconia 

 undata Fabricius (see Fig. 300), is a cylindrieal jumping 

 insect nearly half an inch long, which is said to lay 

 its eggs in single rows in the wood of the canes. Be- ^^^- '^^O- 

 sides attacking the leaves, this bug punctures with its 

 beak the stems of the bunches of grapes, causing the 

 stems to wither and the bunches to drop off. Some- 

 times it pumps out the sap so vigorously from the 

 succulent branches that the drops fall in quick succession 

 from its body. 



In the southern parts of Illinois this insect is at times very 

 numerous, becoming then one of the worst enemies the grape- 

 grower has to contend with. 



No. 159. — The Single-striped Tree-hopper, Thelia univittata 

 Harris, is shaped much like a beech-nut, with a perpendicular 

 protuberance on the fore part of its back higher than it is 

 wade, and its summit rounded. The insect is of a chestnut- 

 brown color, taw^iy white in front, and with a white stripe 

 along the back, extending from the protuberance to the tip. 

 It is about one-third of an inch long and a quarter of an 

 inch in height, and may often be seen on grape-vines in July 

 and Auf^ust. 



No. 160. — Another species is the Black-backed Tree-hopper, 

 Acidalis dorsalis (Fitch), a small, triangular, shining insect 

 with a smooth, rounded back. Its color is greenish white, and 

 it has a large black spot on its back, from the anterior corners 

 of which a black line runs off towards each eye ; the upper 

 margin of the head and the breast are also black. The female 

 is about one-fifth of an inch long, the male smaller. This 

 species is sometimes found in considerable numbers on grape- 

 vines about the last of July, and a few^ stragglers usually 

 remain until October. 



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